package io.github.bluesbruce.client;

import io.github.bluesbruce.commons.Constant;
import io.github.bluesbruce.commons.TransferFile;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.serialization.ClassResolvers;
import io.netty.handler.codec.serialization.ObjectDecoder;
import io.netty.handler.codec.serialization.ObjectEncoder;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * 文件上传，Netty客户端
 *
 * @author BBF
 */
public class DolphinClient {

  private final String host;
  private final int port;

  /**
   * Netty客户端
   *
   * @param host 连接地址
   * @param port 端口
   */
  public DolphinClient(String host, int port) {
    this.host = host;
    this.port = port;
  }

  /**
   * 上传文件
   *
   * @param file 传输文件DTO
   * @throws InterruptedException 线程异常
   * @throws IOException          IO异常
   */
  public void connect(final TransferFile file) throws InterruptedException, IOException {
    Path path = Paths.get(file.getFile().toURI());
    if (Files.notExists(path)) {
      throw new FileNotFoundException(path.toString());
    }
    if (Files.isDirectory(path)) {
      // 如果上传的不是文件，抛出异常
      throw new IOException(String.format(Constant.NOT_VALID_FILE, path.toString()));
    }
    if (!Files.isReadable(path)) {
      // 上传文件不可读，抛出异常
      throw new IOException(String.format(Constant.UNABLE_READ_FILE, path.toString()));
    }
    EventLoopGroup group = new NioEventLoopGroup();
    try {
      Bootstrap b = new Bootstrap();
      b.group(group)
          .channel(NioSocketChannel.class)
          .option(ChannelOption.TCP_NODELAY, true)
          .handler(new ChannelInitializer<SocketChannel>() {
            @Override
            protected void initChannel(SocketChannel ch) {
              ch.pipeline().addLast(new ObjectEncoder());
              ch.pipeline().addLast(new ObjectDecoder(Integer.MAX_VALUE,
                  ClassResolvers.weakCachingConcurrentResolver(null)));
              ch.pipeline().addLast(new DolphinClientHandler(file));
            }
          });
      ChannelFuture f = b.connect(this.host, this.port).sync();
      f.channel().closeFuture().sync();
    } finally {
      group.shutdownGracefully();
    }
  }
}



